drm/msm/dpu: correct DP MST interface configuration

drm/msm/dpu: correct DP MST interface configuration

Due to historical reasons we ended up with dummy values being specified
for MST-related interfaces some of them had INTF_NONE, others had
non-existing DP controller indices. Those workarounds are no longer
necessary. Fix types and indices for all DP-MST related INTF instances.

The only exception is INTF_3 on SC8180X, which has unique design. It can
be used either with INTF_0 / DP0 or with INTF_4 / DP1. This interface is
left with the dummy value until somebody implements necessary bits for
that platform.

Co-developed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/713988/
Link: https://lore.kernel.org/r/20260325-fix-dp-mst-interfaces-v1-1-186d1de3fa1b@oss.qualcomm.com